The dipole anisotropy of the 2 micron all-sky redshift survey

Download

Date

2006-06-01

Author

Erdogdu, P.
Huchra, J. P.
Lahav, O.
Colless, M.
Cutri, R. M.
Falco, E.
George, T.
Jarrett, T.
Jones, D. H.
Kochanek, C. S.
Macri, L.
Mader, J.
Martimbeau, N.
Pahre, M.
Parker, Q.
Rassat, A.
Saunders, W.

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

85
views

0
downloads

We estimate the acceleration on the Local Group (LG) from the 2 Micron All-Sky Redshift Survey (2MRS). The sample used includes about 23 200 galaxies with extinction-corrected magnitudes brighter than K(s)= 11.25 and it allows us to calculate the flux-weighted dipole. The near-infrared flux-weighted dipoles are very robust because they closely approximate a mass-weighted dipole, bypassing the effects of redshift distortions and require no preferred reference frame. This is combined with the redshift information to determine the change in dipole with distance. The misalignment angle between the LG and the cosmic microwave background (CMB) dipole drops to 12 degrees +/- 7 degrees at around 50 h(-1) Mpc, but then increases at larger distances, reaching 21 degrees +/- 8 degrees at around 130 h(-1) Mpc. Exclusion of the galaxies Maffei 1, Maffei 2, Dwingeloo 1, IC342 and M87 brings the resultant flux dipole to 14 degrees +/- 7 degrees away from the CMB velocity dipole. In both cases, the dipole seemingly converges by 60 h(-1) Mpc. Assuming convergence, the comparison of the 2MRS flux dipole and the CMB dipole provides a value for the combination of the mass density and luminosity bias parameters Omega(0.6)(m)/b(L)= 0.40 +/- 0.09.

Subject Keywords

Methods, Data analysis, Local group, Cosmology, Observations, Large-scale structure of universe, İnfrared, Galaxies

URI

https://hdl.handle.net/11511/68611

Journal

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

DOI

https://doi.org/10.1111/j.1365-2966.2006.10243.x

Collections

Department of Physics, Article

Suggestions

OpenMETU
Core

The differential production cross section of the phi(1020) meson in root s=7 TeV pp collisions measured with the ATLAS detector Aad, G.; et. al. (2014-07-01) A measurement is presented of the phi x BR(phi -> K+ K-) production cross section at root s = 7 TeV using pp collision data corresponding to an integrated luminosity of 383 mu b(-1), collected with the ATLAS experiment at the LHC. Selection of phi(1020) mesons is based on the identification of charged kaons by their energy loss in the pixel detector. The differential cross section is measured as a function of the transverse momentum, pT, phi, and rapidity, y(phi), of the phi(1020) meson in the fiducial regi...
The optical spectroscopic and photometric observations of the optical counterparts to the be/x-ray binary systems: gro j2058+42 and v0332+53 Özbey, Mehtap; Kızıloğlu, Ümit; Department of Physics (2008) The spectroscopic and photometric observations of the optical counterparts to the Be/X-ray binary systems GRO J2058+42 and V0332+53 (BQ Cam), taken with RTT150 (Russian-Turkish 1.5 meter Telescope), are presented in this study. The distance, color and the reddening estimates for both sources, obtained via photometric observations, are consistent with the previous results. The results of our spectroscopic observations performed between May 2006 and June 2008 for optical counterpart to GRO J2058+42 indicate t...
Measurement of the production cross section for a W boson and two b jets in pp collisions at root s=7 TeV Chatrchyan, S.; et. al. (Elsevier BV, 2014-07-01) The production cross section for a Wboson and two b jets is measured using proton-proton collisions at v root s = 7 TeV in a data sample collected with the CMS experiment at the LHC corresponding to an integrated luminosity of 5.0 fb(-1). The W + bbevents are selected in the W..decay mode by requiring a muon with transverse momentum pT> 25GeVand pseudorapidity |eta| 25GeVand |eta| < 2.4. The measured W + bbproduction cross section in the fiducial region, calculated at the level of final-state particles, is...
The CMS barrel calorimeter response to particle beams from 2 to 350 GeV/c Abdullin, S.; et. al. (Springer Science and Business Media LLC, 2009-04-01) The response of the CMS barrel calorimeter (electromagnetic plus hadronic) to hadrons, electrons and muons over a wide momentum range from 2 to 350 GeV/c has been measured. To our knowledge, this is the widest range of momenta in which any calorimeter system has been studied. These tests, carried out at the H2 beam-line at CERN, provide a wealth of information, especially at low energies. The analysis of the differences in calorimeter response to charged pions, kaons, protons and antiprotons and a detailed ...
Measurement of the Upsilon(1S), Upsilon(2S), and Upsilon(3S) cross sections in pp collisions at root s=7 TeV Chatrchyan, S.; et. al. (2013-11-01) The Upsilon(1S), Upsilon(2S), and Upsilon(3S) production cross sections are measured using a data sample corresponding to an integrated luminosity of 35.8 +/- 1.4 pb(-1) of proton-proton collisions at root s = 7 TeV, collected with the CMS detector at the LHC. The Upsilon resonances are identified through their decays to dimuons. Integrated over the Upsilon transverse momentum range p(T)(Upsilon) < 50 GeV/c and rapidity range vertical bar y(Upsilon)vertical bar < 2.4, and assuming unpolarized Upsilon produc...

Citation Formats

P. Erdogdu et al., “The dipole anisotropy of the 2 micron all-sky redshift survey,” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, pp. 1515–1526, 2006, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/68611.